Door-check.



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DOOR CHECK. APPLICATION FILED NOV. 9. 1914.

Patented Sept; 12, 1916.

ATTORNEY LUDWIG M. DIETERICI-I, F MOUNT VERNON, NEW YORK, ASSIGNOR TO TRANSPORTA- TION UTILITIES COMPANY, OF NEW YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

chester and State of New York, have made and invented certain new and useful Improvements in Door-Checks, of which the picting the disposition of parts after the following is a specification.

This. invention relates to a door check and more particularly to one of that class de pendent upon friction to prevent the rapid movement or slamming of a door.

The invention, more broadly stated, relates to a motion check, that is, may be utilized to either partially or entirely check, impede, or retard the motion of two relatively moving objects.

Among the objects of the invention is the provision of a retarding or impeding force tending to check the relative motion of two objects wherein the impeding force increases more rapidly than, although the direct result of, the pressure tending to produce such motion, the device being thus especially useful in oonnectlon w1th and adapted to control the motion of doors, thus constituting a novel and advantageous door check, although it is to be noted that I do not limit myself to such usages.

A further object is to provide a door check of simple and cheap construction so constituted that while the impeding or checking force will prevent the rapid closing or slamming of the door, it will allow the door to be opened with-little effort, the checkingj force although present, being of relatively small proportion. I

A further objectis to provide a door check easily and readily securable to a door and the adjoining door frame, and so arranged that the frictional resistance to motion of the door may be easily and readily a.d-.

Specification of Letters Patent.

DOOR-CHECK.

Patented Sept. 12, 1916.

Application filed November 9, 1914. Serial No. 870,944.

fication and forming apart thereof, the preferred embodiment of my invention is illustrated, in which Figure 1 is a top plan viewofthe device, illustrating the same as being connected to a door and acting in the capacity of a door check, the dotted lines diagrammatically dedoor has been opened. Fig. 2 is a view in front elevation thereof. Fig. 3 is a view in horizontal section taken on the line 33 of Fig. 2. Fig. 4c is a cross-sectional view taken on the line 44 of Fig. 2. .Fig. 5 is a view of a somewhat modified form of the friction member disclosing the same as being internally cored and provided with frictional inserts.

Referring to the drawings in which similar reference numerals designate corresponding parts throughout the several views, a door is movably secured to the frame 11 by the hinges 12, and in connection with which my improved door check is to be used although it is to be understood that the apparatus may be utilized to impede or retard the motion of any relativelymovable objects.

. A bracket 13 is rigidly secured to the door frame and includes a pair of spaced ears 14 to and between which a rod 15 is secured, the securement in question being effected by a bolt 16. A spring 17 engages one of the cars 14 and the rod 15 and as thus arranged is adapted to return 'the door to its closed position, although other styles of door closers may be employed, if desired. The rodis bent intermediate its ends as at 18, thus allowing the door check to be utilized with doors which turn through 180, such positions being illustrated by the full and dotted lines Fig. 1. The pivotal securement of the rod 15 is spaced a distance from the pivotal mounting of the door, thus providing that a friction member 19 which is slidably mounted upon the rod and pivotally secured to the door will be moved lengthwise of the rod upon the movement of the door in either direction. The sleevelike friction member 19 receives the rod 15 therethrough and frictionally engages the same, tending to prevent any motion between the friction member and rod. An ear or lug 20 projects from the sleeve and is provided with the aperture 21 through which extends the connecting arm 22. The connecting arm 22 is threaded and provided with a pair of thumb nuts 23 embracing the ear 20 and holding the connecting arm rigidly locked to the friction member and projecting at an adjustable distance therefrom. The outlying or remote extremity of the connecting arm is provided with an eye 24 which is pivotally secured to the bracket 25 carried by the door 10.

As illustrated in Fig. 3, a force tending to move the door 10 will produce a force A acting at the eye 24 of the connecting arm tending to move the friction member longitudinally of the rod 18. Inasmuch as the friction member tightly and frictionally engages the rod the friction member or sleeve 19 will tend to cant or tilt, materially in creasing the pressure between the sleeve and rod at the remote and opposite points BC, such action materially increasing the friction between the sleeve and rod tending to prevent their relative motion. Thus should a considerable force be brought to bear upon the door 10 tending to slam the same, a correspondingly greater turning moment or canting action will be brought to bear upon the friction member producing a decided increase in the frictional resistance to motion of the friction member and rod and preventing the rapid closing or slamming of the door.

Inasmuch as the turning moment applied to the sleeve or friction member 19, with a given or constant force upon the door, depends upon the length of the arm 22, the frictional resistance to motion between the sleeve and rod may be adjusted by adjust ing the thumb nuts 23; the same resulting in eitheiythe lengthening or shortening of that portion of the connecting arm 22 lying between the sleeve and the pivotal connection with the bracket 25. The speed with which the door closes may therefore be varied by the adjusting thumb nuts 23. The extent of the sleeve or friction member to either side of the arm 22 determines the pressure with which the portions BC or BC bear against the rod 15, the friction member being canted by a given force A, the greater the length of sleeve the smaller the pressure and vice versa. As it is desirable to present little or no impedance to the opening of the door the front or leading portion 26 of the friction member, taken with reference to the movement of the friction member as the door is being opened, is elongated or lengthened as clearly illustrated in Fig. 3. In this connection it is to be noted that the friction at the leading point of contact between the frictionmemher and rod is accumulative in its effect, z. 6., it tends to produce a further canting of the friction member and thus enhances the frictional impedance to motion. Thus the length of sleeve projecting in front of the connecting arm, taken with respect to the direction in which the friction member is moving, largely determines the magnitude of the frictional. resistance. The friction member or sleeve is mounted upon the rod 15 so that the shorter portion of the sleeve will form the leading segment of the friction member as the door is being closed and the longer portion will form the leading segment as the door is being opened, the result of such arrangement being that the door may be easily opened with little or no impedance, or retardation but is prevented from being rapidly closed or slammed, the frictional resistance or retardation varying according to the direction of motion.

The friction member 19 is formed of some material adapted to frictionally engage the rod 15 and may, as illustrated in the modified form in Fig. 5, include a frictional insert 27 especially adapted to frictionally engage the rod 15, fiber being a substance possessing special advantages in this connection. The central portion of the friction member may be cored as illustrated at 28 in Fig. 5, to relieve the pressure and eliminate the friction at these points should it be so desired. A protecting tube 29 is threadedly secured to the friction member 19 and iiicases the rod 15 therein which in connection with a washer or felt brush 3O prevents any settlement of foreign material from permanently adhering to the rod and maintains the same in a bright, clean and operative condition. The washer 30 is disposed within the annular groove or cavity 31 formed in the one end of the friction member and prevents any foreign material from making its way between the rod and friction memher which would tend to destroy the frictional resistance to motion of the same.

From the foregoing it will be apparent that the device may be utilized for various purposes other than for the checking of doors, and in fact may be used to frictionally resist the motion between any two relatively movable parts.

One of the desirable features of the pres ent invention resides in the fact that the friction incident to the canting of the friction member increases in a greater ratio than the pressure producing such motion thus providing that the greater the force tending to move the friction member along the rod the slower will such motion take place, thelength of the sleeve and arm being properly proportioned to produce such effect.

Having thus fully disclosed my invention, what I claim is 1. A mechanism for frictionally impeding the motion of two elements comprising a member, means for securing the same to one of said elements, a friction member mounted upon the first-mentioned member, said frictional member provided with an outstanding arm, means for securing the outlying portions of said arm to the other of said movable elements, and means for varying the length of said arm intermediate said frictional member and its connection with said moving element.

2. A mechanism for frictionally impeding the motion of two elements comprising a member, means for securing the same to one of said elements, a friction member slidably mounted upon said member and provided with an outstanding arm, means for pivotally securing said outstanding arm to the other of said moving elements, and means for varying the length of said arm intermediate its pivotal connection with said element and the friction member.

3. A motion check comprising a member, a friction member mounted thereon and adapted to tilt with respect thereto, said friction member provided with an outlying portion adapted to receive and transmit a force to said friction member tending to slide the same along the first mentioned member and to produce the relative tilting thereof, and means for varying the distance between said first mentioned member and the point of application of said force on the outlying portion of said friction member, to thereby vary the lever arm of said tilting force.

4. An apparatus for frictionally impeding the motion of two elements comprising a member, a friction member mounted thereon and adapted to tilt with respect thereto, so as to vary the friction therebetween, and means carried by said friction member adapted to transmit a tilting force thereto, said means so located with respect to the ends of said friction member that the point of application of a force thereon will lie to one side of the transverse medium plane of said friction member, the friction to motion of said friction member varying with a given tilting force according to the direction thereof.

5. A door check comprising a rod, a friction member mounted thereon and adapted to tilt with respect thereto, an arm projecting from said friction member and mounted so as to exert a tilting force thereon to vary the friction between the rod and friction member, said friction member including a sleeve with a frictional insert therein bearing upon said rod.

(3. A door check comprising a rod, a friction member mounted thereon and adapted to tilt with respect thereto, an arm projecting from said friction member and mounted so as to exert a tilting force thereon to vary the friction between the rod and friction member, said friction member including a frictional insert, said frictional insert provided with a cored central portion.

7. A door check comprising a rod, a friction member slidably mounted thereon, an

arm projecting from and adapted to exert a turning moment upon said friction member, a washer carried by said friction member bearing against said rod adapted to remove foreign material therefrom, and a protecting tube carried by said friction member and housing the one extremity of said rod therein.

8. A door check comprising a rod, a friction member slidably mounted thereon, an.

arm projecting from and adapted to receive and transmit a tilting force, to said friction member, the tilting of said friction member tending to increase the frictional resistance to motion thereof with relation to said rod, and means for lengthening and shortening the projection of said arm whereby the leverage of said tilting force is varied.

9. A door check comprising a rod, a friction member slidably mounted thereon, and adapted to tilt with respect thereto, an arm projecting from and adapted to receive and transmit a tilting force to said friction member to increase the frictional resistance to motion thereof with respect to said rod, and a washer carried by said friction member bearing against said rod and adapted to remove foreign material therefrom.

10. A door check comprising a rod adapted to swing in the plane of movement of the door, a friction member mounted on said rod and adapted to tilt with respect thereto, and means carried by said friction member adapted to pivotally engage a door, said means adapted to exert a tilting force on said friction member with respect to said rod, to tilt said friction member in the plane of movement of said door.

11. The combination with a door and its support, of a rod pivotally secured to said door support, a friction member slidably mounted upon said rod, means carried by said door pivotally engaging said friction member, the pivotal engagement between said means and said friction member located so as to produce a tilting force upon said friction member adapted to tilt the same in the general plane of movement of the said door and rod.

12. A door check comprising a rod adapted to swing in the plane of movement of the door, a friction member mounted on said rod and adapted to tilt with respect thereto, and means carried by said friction member adapted to pivotally engage a door, said means adapted to exert a tilting force on said friction member with respect to said rod, to tilt said friction member in the plane of movement of said door, the tilting of said friction member increasing the frictional resistance to the motion of said door.

13. A door check comprising a rod with means for mounting the same for pivotal motion, a sleeve mounted upon said rod and forming a friction member; an arm. proto tilt said friction member in the general plane of movement of the door, to-vary thcfrictional resistance to motion of said! frictlon member With relation to said rod.

Signed at New York, borough of Manhattan, in the county of New York and State of New York, this 6" day of November, A. D.'

LUDVVIG M. DIETERICI-I. Witnesses:

ANNA V. VVALsI-I, GEORGE E. Coon.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of lfatenfcs, Washington, .D. G. 

